Each table column represents an attribute.
One's perception of a table is that it is a two-dimensional structure with rows and columns. A single entity occurrence inside the entity set is represented by each table row (tuple). Each column in a table in a database represents an attribute and has a unique name and datatype. A single piece of data is represented by each intersection of a row and a column. A column's values must all adhere to the same data format (datatype). The attribute domain, or range of values for each column, is distinct. The DBMS does not care what order the rows and columns are in. Each row in a table needs to be uniquely identified by an attribute or set of characteristics.
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